Multi-Emissive Difluoroboron Dibenzoylmethane Polylactide Exhibiting Intense Fluorescence and Oxygen-Sensitive Room-Temperature Phosphorescence

Abstract

Boron difluoride compounds are light emitting materials with impressive optical properties. Though their strong one- and two-photon absorption and intense fluorescence are well-known and exploited in molecular probes, lasers, and photosensitizers, phosphorescence, in contrast, is typically observed only at low temperatures. Here, we report that unusual room-temperature phosphorescence is achieved by combining a classic boron dye, difluoroboron dibenzoylmethane, BF2dbm, with poly(lactic acid) (PLA), a common biopolymer, resulting in a highly sensitive single-component oxygen sensor. Fluorescence quantum yields are enhanced, and temperature-sensitive delayed fluorescence is also observed. Multi-emissive BF2dbmPLA biomaterials show great promise as multifunctional molecular probes and sensors.

Tuning the Emission Colour of Triphenylamine‐Capped Cyclometallated Platinum(II) Complexes and Their Application in Luminescent Oxygen Sensing and Organic Light‐Emitting Diodes

“…[20][21][22][23][24][25]32,33] Luminescent O 2 sensing is based on the quenching effect of O 2 on the phosphorescence emission of the complexes. [21,[34][35][36][37][38] To address the drawbacks of emission-intensity-based O 2 sensing, lifetime-based sensing or ratiometric sensing is desired. [21][22][23][24] Lifetime-based O 2 sensing requires phosphorescent dyes with longer luminescent lifetimes.…”

Ratiometric Single‐Nanoparticle Oxygen Sensors for Biological Imaging

“…[8][9][10][11] Oxygen sensing by phosphorescence quenching is noninvasive, sensitive, selective for oxygen, and can be implemented for real-time measurements as well as highresolution oxygen mapping in tissue. [12][13][14][15] While conventional phosphorescent dyes for oxygen sensing are typically based on organometallic complexes and metalloporphyrins, [16,17] efforts to synthesize new chromophores with improved characteristics, [18,19] or to modify them for applications such as multiphoton microscopy have also been reported. [20] There is currently considerable interest in the development of nanoparticle-based optical oxygen sensors.…”

Indicators for optical oxygen sensors

“…This is usually done by using bandpass filters or, alternatively, by attributing the emissions of the components to different color channels of an RGB camera [128,212,228]. A more elegant solution is an application of tailor-made indicators which possess dual emission (oxygen-sensitive phosphorescence and oxygen-insensitive fluorescence) but very few examples have been reported so far [244,254,256,258].…”